Most of the offshore thick oil thermal recovery wells are horizontal wells,with large reservoir depth and large heat loss along the wellbore,and the wellbore thermal insulation method of"insulated tubing+nitrogen injection in the annulus"is currently adopted,which is characterized by large nitrogen injection volume,high cost,and the risk of vaporization,etc.In this regard,a multi-channel thermal packer has been developed.For this reason,a multi-channel heat-sensitive packer was developed.Through the preferred expansion agent,the packer can rely on the expansion agent without Kawa thermal sealing,cooling rubber tube contraction uplift unsealing mining,high operational safety;the main body adopts the eccentric structure design,increase the annulus nitrogen injection/backwash wells,liquid control pipelines and fiber optic cables through the channel and supporting the single-flow valve,to meet the offshore thermal mining wellbore tubing has a nitrogen injection channel and monitoring of the special requirements.Indoor tests show that:the sealer seating temperature of 240℃,temperature resistance of 350℃,pressure resistance of 21MPa,single-flow valve opening pressure difference of less than 1.5MPa,seating and unsealing safe and reliable,good sealing performance,in the offshore thick oil thermal recovery has a good prospect of popularization and application.
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